Adjustable bracket



ROBERT s. REDMAN, OE NEWARK, NEW JERsEY.

ADJUSTABLE BRACKET.

SPECIFICATION forming;- pa rt of Letters Patent No. 274,223,,dated March20, 1883. Application filed July so, 1882. (No model.)

.To all whom it mag concern:

Be it known that 1, ROBERT S. REDMAN, a citizen of the UnitedStates,residing at Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in AdjustableBrackets for Dental and other Purposes; and Ido hereby declare thefollowing to be a fnll, clear, and exand myself, wherein a rod engagedwith a toothed segment formed upon the end of one of the parallel arms.This device was defective, in that there was between each bite of therod with a tooth a considerabletamount of play, amounting ordinarily toabout an inch and a half, at the tablet, so that oftentimes said tabletcould not be placed in the exact position desired, but the same wouldresta little above or below the desired point.

The object of this invention is to overcome the above objections, and atthe same time to simplify and reduce the cost of construction.

Referring to the accompanying drawings, in which similar letters ofreference indicate like parts in each of the several figures, Figure 1is a side elevation of a bracket embodying my improvements, and Fig. 2.is an enlarged sectional view of the same, clearly illustrating theinternal arrangements of the several parts. Figs. 3 and 4 illustratemodified forms of the invention, involving the same principles, butvarying in detail construction. In said drawings, a a are parallel arms,

hinged or pivoted at oneend to a swinging plate, 1), adapted to besecured to the wall or other surface, 0, by suitable means. The otherends aresimilarly hinged or pivoted to an extension-piece, d,which maycarry or be construoted to carry a lamp, druggists bottles,

dentists tablet, or a second extension piece, 0, pivoted thereon,adapted to swine, laterally. The extension-piece is preferably cored outto receive the ends of the arms a a, as shown. The arm a is providedwith a segmental extremity, f, and the extension-piece is constructed insuch a manner as that a portion thereof will form a nearingsurface,between which and the extremity of the arm thejambpiece lies. Saidjamh-piece is lettered t'in the drawings.- The'portion furnishing thebearing-surface may be cast integral with the extension-piece and beindependent of the ti ngerpiece, as in Figs. 1 and 3, or it may form apivotal center for the finger-piece, as well as a bearing-surface forthe jambing portion there- 'of, as shown in Fig. 4. In the latter casethe jamb-piece and finger-piece are in intimate combination, the sameindependent results bein g performed as when the parts are separated,all as will beobvious. Between the peripheral edge of the segment andbearing-surface is formed a recess or aperture adapted to receive aroller, 5, or jamb-piece, into which said jainbpiece is placed,substantially as shown in Figs. 1, 2, 3, and 4, its periphery engagingwith the segment and eccentrita Downward. pressure brought to bear onthe extension-piece 61 causes the segment to throw, roll, or jam theroller coming the weight of the extension-piece d and its burden.

The extension-piece may be elevated by simply raising the same by thehand; but should I desire to lower the same, it becomes necessary toprovide suitable means for holding the jamb-piece out of engagement withthe segment. This may be accomplished in several ways, some of which areillustrated-as, for example, the jamb-piece may be raised by means of awedge, K, as shown in Figs. 1 and 2, or by a pivotal finger-piece, asshown in Fig. 3, or the said means may be integral with the jamb-piece.

The jamh-piece may fall between the eccentric and segment by its ownweight, or may be forced therebetween by a spring, at, arrangedinsuitable bearings, the latter method being preferable, as it producesa more certain result.

or either of them, to increase friction, by which, however, I do notwish to be understood as forming a ratchet or cogged periphery, by whichfriction would be prevented.

I am aware that jamb-pieces have heretofore been used in connection withhinges for schoolfurniture, aud therefore this feature I do not wish tobe understood as claiming broadly.

I am also aware that in United States Patent No.127,7il8 parallel armsfitQShOWilfWl'llCh are held into either adjustable or fixed relation bya thumb-screw. By partially screwing the said arms together necessaryfriction is given to support a considerable weight, in which conditionthe parts may be adjusted so that the extension -piece' may be broughtto any exact position; but in this case, should the screw be adjusted tobring the parts so What I claim, and desire to have secured by LettersPatent, is

1. In combination, in an adjustable bracket, arms a a, wall-plate b,extension-piece d, bearing-surface g, segment f, jamb-piece i, spring m,and ayfiuger-piece, all arranged and operating substantially as and forthe purposes herein set forth and shown.

2. In combination, in an adjustable bracket, arms a a, plate b,extension-piece d, provided with spring-socket and bearing-surface,segmental portion f, jamb-piece t, spring m, and

finger-piece adapted to raise said jamb-piece,

all arranged and combined substantially as herein set forth, for thepurposes specified.

3. As an improved article of manufacture, an adjustablebracketcotn'oiningthereinawallplate, b, parallel arms a a, the latter ofwhich is provided with a segmental portion, an extension-piece havingsaid arms a a pivoted therein, and having a. bearing-surface, 9,therein, and ajatnb-piece, t', lying in a chamber in saidextension-piece, said jamb-piece, bearingsurface, and arms beingarranged in relation to the eXtension-pieceand adapted to cause saidextension-piece to automatically resist downward pressure, and to allowan unobstructed elevation of the same, all as herein set forthand'shown.

In testimony thatIclaim the foregoing I have hereunto set my hand this15th day of July, lssz. ROBERT S. REDMAN.

Witnesses:

CHARLES H. PELL, J. A. HENRICH.

